Essentially for all those questions that get bumped from the currently existing sites for being in the wrong place. E.g. if a perfectly good and interesting question has no natural home in the existing family of 'stack' sites it could 'fall off the end' and find a home at an 'odds and ends' catch-all site. A sort of SO reject bin if you like.

You could call it 'orphaned storage'.

Periodically the tag stats could be analysed to sift for promising new stack sites.

Jeff has often stated an opinion that you can't have a site with no topic/focus, it will just end up poorly supporting everything. At which point it becomes very hard to build community and get quality, reliable answers. Obviously, you can make what you want with a stackexchange site, but I would not expect to see Jeff and his team create an "odds and ends" site.

Possibly, but I wonder if you would get small sub-communities forming around certain tags. As such you could cut through the noise by focusing on tags you that represent communities you align with. If a specific tag become popular then we can spawn a site specifically for that subject and migrate the questions over. It's a sort of melting pot if you like (there's another potential site name).
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locsterOct 12 '09 at 20:52